조기 흡기 밸브 닫힘과 분사시기 변경을 통한 가솔린 직분사 엔진에서의 혼합기 형성 및 난류특성에 관한 수치적 연구

Abstract

Early intake valve closing was purposed to reduce pumping lose in a gasoline directinjection engine. Reduced turbulence intensity was supplemented by injecting fuel. To compare effects of applying early intake valve closing, throttling case was alsoinvestigated. Early intake valve closing induces high turbulence kinetic energy. However, throttling case has higher turbulence kinetic energy than throttling case at TDC. Late injection intensifies turbulence intensity in both case while it reduces fuel-air mixture homogeneity.